One year old baby sleep sweating especially belongs to the normal physiological phenomenon, caused by the baby’s physiological structure; a few are also seen in some pathological phenomena, such as rickets and so on. 1. Physiological reasons: baby one year old thermoregulation center development is incomplete, easy to cause vagus nerve excitation during sleep, in addition to the baby’s active sweat glands are concentrated in the head, so it will cause the head to increase the amount of sweat when sleeping. In addition, the baby’s metabolism is more vigorous, sleeping with too thick bedding can also cause increased sweating. 2. Pathological reasons: rickets due to the lack of vitamin D, causing metabolic abnormalities in the body, causing increased sweating while sleeping, accompanied by easy to scare, bone deformities. There may be other reasons why one year old babies sweat a lot when they sleep, so we suggest that you go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.